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Talk:Quark (particle), Memory Alpha
Neutron - Wikipedia
What is the difference between up and top quarks? - Quora
How to determine the charge of each quark in an atom - Quora
How many quarks does a hydrogen atom have? - Quora
Quarks
Open Hypervideo
How Do We Know Quarks Exist If They Have Never Been Directly Detected?
There are no free quarks. Other particles — electrons, neutrinos…, by Ethan Siegel, Starts With A Bang!
The Standard Model of Particle Physics, by Jhanak Shrestha
PPT - Quarks PowerPoint Presentation, free download - ID:315866
J/psi meson - Wikipedia